说明
Weber Number - Engineering Fluid Mechanics Dimensionless Value
Features:
- Instant calculation
- Result are copy able to other app
- Formula are include as reference
- Support up to 16 decimal place
- Support various unit for each input
The Weber number (We) is a dimensionless number in fluid mechanics that is often useful in analyzing fluid flows where there is an interface between two different fluids, especially for multi-phase flows with strongly curved surfaces.
Formula
Weber Number :
We = ρv²L/σ
Density :
ρ = Weσ/v²L
Velocity :
v= √Weσ/ ρL
Characteristic Length :
L = Weσ/ ρv²
Surface Tension :
σ = ρv²L/We
Where:
We = Weber Number
ρ = Density
v = Velocity
L = Characteristic Length
σ = Surface Tension
One application of the Weber number is the study of heat pipes. When the momentum flux in the vapor core of the heat pipe is high, there is a possibility that the shear stress exerted on the liquid in the wick can be large enough to entrain droplets into the vapor flow. The Weber number is the dimensionless parameter that determines the onset of this phenomenon called the entrainment limit (Weber number greater than or equal to 1). In this case the Weber number is defined as the ratio of the momentum in the vapor layer divided by the surface tension force restraining the liquid, where the characteristic length is the surface pore size.
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